皮皮学，免费搜题
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搜题
【单选题】
利用大棚栽培农作物，科技人员常棚内施放适量的二氧化碳。这是因为A.
会使大棚内的温度升高
B.
二氧化碳可使害虫窒息死亡，防治植物的病虫害
C.
二氧化碳可促进植物进行光合作用
D.
二氧化碳能灭火，可避免火灾的发生
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】They are building a new supermarket in this district. (passive voice)
【简答题】They are building a new park in our city.
【单选题】---What are the workers doing over there? ---They are building a ________ ship.
A.
ten-thousands-ton
B.
ten-thousand-tons
C.
ten-thousand-ton
D.
ten-thousands-tons
【单选题】They are building a new bridge ______ the river .
A.
across
B.
over
C.
through
D.
pass
【单选题】They are building a dam in ______ with another firm.
A.
comparison
B.
association
C.
touch
D.
tune